Two positively-charged plastic straws near each other tend to
A) attract each other.
B) repel each other.
C) neutralize each other.
Answer: B
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In the context of star sizes, which of the following statements is true of a star's luminosity?
A) A hot star may not be very luminous if it has a small surface area. B) The luminosity of a star is proportional to its visual wavelength. C) A cool star can be luminous if it has a small surface area. D) The luminosity of a glowing object is determined by its density.
Two cars are traveling around identical circular racetracks. Car A travels at a constant speed of 20 m/s. Car B starts at rest and speeds up with constant tangential acceleration until its speed is 40 m/s. When car B has the same (tangential) velocity as car A, it is always true that:
a. it is passing car A. b. it has the same linear (tangential) acceleration as car A. c. it has the same centripetal acceleration as car A. d. it has the same total acceleration as car A. e. it has traveled farther than car A since starting.
Which of the following is true about Bragg planes?
(Choose all that apply.) Observatories on mountaintops can detect
A) visible light. B) x-rays. C) a small portion of the infrared spectrum. D) very-long-wavelength infrared light. E) radio waves.